add age calculator tutorial

Author: x4nth055

README.md

@@ -240,5 +240,6 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
     - [How to Build a Spreadsheet App with Tkinter in Python](https://www.thepythoncode.com/article/spreadsheet-app-using-tkinter-in-python). ([code](gui-programming/spreadsheet-app))
     - [How to Make a Rich Text Editor with Tkinter in Python](https://www.thepythoncode.com/article/create-rich-text-editor-with-tkinter-python). ([code](gui-programming/rich-text-editor))
     - [How to Make a Python Code Editor using Tkinter in Python](https://www.thepythoncode.com/article/python-code-editor-using-tkinter-python). ([code](gui-programming/python-code-editor/))
+    - [How to Make an Age Calculator in Python](https://www.thepythoncode.com/article/age-calculator-using-tkinter-python). ([code](gui-programming/age-calculator))
 
 For any feedback, please consider pulling requests.

gui-programming/age-calculator/README.md

@@ -0,0 +1 @@
+# [How to Make an Age Calculator in Python](https://www.thepythoncode.com/article/age-calculator-using-tkinter-python)

gui-programming/age-calculator/age_calculator_cli.py

@@ -0,0 +1,27 @@
+from datetime import date
+
+def calculate_age(day, month, year):
+    # we are getting the current date using the today()
+    today = date.today()
+    # convering year, month and day into birthdate
+    birthdate = date(year, month, day)
+    # calculating the age 
+    age = today.year - birthdate.year - ((today.month, today.day) < (birthdate.month, birthdate.day))
+    # return the age value
+    return age
+
+
+# the try/except block
+# the try will execute if there are no exceptions
+try:
+    # we are getting day, month and year using input() function
+    day = input('Enter day:')
+    month = input('Enter month:')
+    year = input('Enter year:')
+    # creating a variable called calculated_age and we are also calling the claculate_age function
+    age_result = calculate_age(int(day), int(month), int(year))
+    print(f'You are {age_result} years old')
+    
+# the except will catch all errors
+except:
+    print(f'Failed to calculate age, either day or month or year is invalid')

gui-programming/age-calculator/age_calculator_ui.py

@@ -0,0 +1,105 @@
+from tkinter import *
+from tkinter import ttk
+from datetime import date
+from tkinter.messagebox import showerror
+
+
+# the function for calculating the age
+def calculate_age():
+    # the try/except block
+    try:
+        # getting current date
+        today = date.today()
+        # getting day from the day entry
+        day = int(day_entry.get())
+        # getting month from the month entry
+        month = int(month_entry.get())
+        # getting year from the year entry
+        year = int(year_entry.get())
+        # creating a date object
+        birthdate = date(year, month, day)
+        # calculating the age
+        age = today.year - birthdate.year - ((today.month, today.day) < (birthdate.month, birthdate.day))
+        # displaying the age using the age result label
+        age_result.config(text='You are ' + str(age) + ' years old')
+    # if an error occurs the showerror window will pop up
+    except:
+        showerror(title='Error', message='An error occurred while trying to ' \
+                    'calculate age\nThe following could ' \
+                    'be the causes:\n->Invalid input data\n->An empty field/fields\n'\
+                     'Make sure you enter valid data and fill all the fields')
+
+
+
+# creating the main window
+window = Tk()
+# the title for the window
+window.title('Age Calculator')
+# the dimensions and position of the windodw
+window.geometry('500x260+430+300')
+# making the window nonresizabale
+window.resizable(height=FALSE, width=FALSE)
+
+# the canvas to contain all the widgets
+canvas = Canvas(window, width=500, height=400)
+canvas.pack()
+
+# ttk styles for the labels
+label_style = ttk.Style()
+label_style.configure('TLabel', foreground='#000000', font=('OCR A Extended', 14))
+
+# ttk styles for the button
+button_style = ttk.Style()
+button_style.configure('TButton', foreground='#000000', font=('DotumChe', 16))
+
+# ttk styles for the entries
+entry_style = ttk.Style()
+entry_style.configure('TEntry', font=('Dotum', 15))
+
+# the label for displaying the big text
+big_label = Label(window, text='AGE CALCULATOR', font=('OCR A Extended', 25))
+
+# placing the big label inside the canvas
+canvas.create_window(245, 40, window=big_label)
+
+
+# label and entry for the day
+day_label = ttk.Label(window, text='Day:', style='TLabel')
+day_entry = ttk.Entry(window, width=15, style='TEntry')
+
+# label and entry for the month
+month_label = ttk.Label(window, text='Month:', style='TLabel')
+month_entry = ttk.Entry(window, width=15, style='TEntry')
+
+# label and entry for the year
+year_label = ttk.Label(window, text='Year:', style='TLabel')
+year_entry = ttk.Entry(window, width=15, style='TEntry')
+
+# the button 
+calculate_button = ttk.Button(window, text='Calculate Age', style='TButton', command=calculate_age)
+
+# label for display the calculated age
+age_result = ttk.Label(window, text='', style='TLabel')
+
+
+# adding the day label and entry inside the canvas
+canvas.create_window(114, 100, window=day_label)
+canvas.create_window(130, 130, window=day_entry)
+
+# adding the month label and entry inside the canvas
+canvas.create_window(250, 100, window=month_label)
+canvas.create_window(245, 130, window=month_entry)
+
+# adding the year label and entry inside the canvas
+canvas.create_window(350, 100, window=year_label)
+canvas.create_window(360, 130, window=year_entry)
+
+# adding the age_result and entry inside the canvas
+canvas.create_window(245, 180, window=age_result)
+
+# adding the calculate button inside the canvas
+canvas.create_window(245, 220, window=calculate_button)
+
+
+# runs the window infinitely until uses closes it
+window.mainloop()